CHEMISTRY HIGH SCHOOL

Which of the following is represented in the highest percentage by volume in dry air?a. Carbon dioxide
b. Oxygen
c. Hydrogen
d. Nitrogen

Answers

Answer 1
Answer:

Answer: The correct answer is Option d.

Explanation:

Dry air is composed of a mixture of gases like argon, oxygen, nitrogen, carbon dioxide and many other gases present in trace amount.

The percentage of these gases by volume in dry air is:

Carbon dioxide = 0.03%

Argon = 0.93%

Oxygen = 20.95%

Nitrogen = 78.09%

Hydrogen = Trace amounts

From the above percentage values, we can easily say that nitrogen has the highest percentage by volume in dry air. Hence, the correct option is d.
Answer 2
Answer: nitrogen is the highest percent of 93%

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Over-encouraging lesser skilled players can lead to embarrassment.
a. True
b. False

Answers

Answer: Option (a) is correct.

Explanation:

A person with less skills needs to work more or practice more on his abilities in order to improve their athletic ability to build a stronger team.

Over encouragement to lesser skilled person can lead to the development of over confidence. As after over encouragement, the less skilled person can have the illusion of knowing each and everything which is not true for anyone.

As no one is perfect, therefore, over-encouraging lesser skilled players can lead to embarrassment.
My answer would be a. True

if you are finding the value of a 10 g piece of metal that has a value of 5 dollars/ 1 gram what would be my final unit

Answers

5/1 = 10/x

5x = 10
--- -----
5. 5

X = 2 dollars

You walk in the front door of your home. You smell an onion that someone is cutting in the kitchen. Explain why you are able to smell it, what this process is called, and what other types of substances exhibit this behavior.

Answers

Answer: We are able to smell it because the particles move from their high concentration to low concentration and mix with the gases present in the atmosphere and thus we are able to smell it.

Diffusion is a process in which a movement of substance takes place from a high concentration area to a low concentration area due to the random movement of the particles. Diffusion happens in gases more faster than liquids and solids because of the random movement of their particles.

Other substances exhibiting this behavior is perfume, incense sticks and cooking of food etc.
This is the process of diffusion and is exhibited by gases. The compounds responsible for the smell of onions are released into the air and diffuse through out the house due to random molecular movement. This allows you to smell them at the entrance of your house.

What is happening in this picture? Look at the food colouring and explain using the following terms: solute, solvent, dissolving, homogenous.​

Answers

Answer:

picture is not visible....................

Which of the following form solid solutions? Select all that apply.naturally occurring minerals
gases present in air
HCl and water
sugar and water
metal alloys

Answers

 I believe the answer is
naturally occurring minerals
metal alloys

The metal alloy is a solid solution that made of metal and other elements. 
The example of an alloy is bronze, which is made of copper mixed with nickel, aluminum, zinc or manganese. Most minerals should form a solid solution too, but not all of them.Gases present in air is not solid at all. A solution of HCl and sugar will not form solid solution either.

Answer:

naturally occurring minerals

metal alloys

Explanation:

20g of sugar is stirred into a beaker containing 100 g of water. After the sugar has completely dissolved, the solution is put on the scale. What is the mass of the solution ? help A) 20g B) 80g C) 100g D) 120g

Answers

The correct answer is: Option (D) 120g

Explanation:

We are given the following:

Mass of sugar = 20 g

Mass of water = 100 g


When sugar is completely dissolved into water, the mass of the solution will get:


mass-of-solution = mass-of-sugar + mass-of-water

mass-of-solution = 20 + 100

mass-of-solution = 120 g (Option D)
Its D I Think because mass cant really disappear
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